/*
 * Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: TrAXFilter.java,v 1.2.4.1 2005/09/06 12:23:19 pvedula Exp $
 */


package com.sun.org.apache.xalan.internal.xsltc.trax;

import java.io.IOException;

import javax.xml.XMLConstants;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.ErrorListener;
import javax.xml.transform.Templates;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.sax.SAXResult;

import com.sun.org.apache.xml.internal.utils.XMLReaderManager;

import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLFilterImpl;
import org.xml.sax.helpers.XMLReaderFactory;

/**
 * skeleton extension of XMLFilterImpl for now.
 *
 * @author Santiago Pericas-Geertsen
 * @author G. Todd Miller
 */
public class TrAXFilter extends XMLFilterImpl {

  private Templates _templates;
  private TransformerImpl _transformer;
  private TransformerHandlerImpl _transformerHandler;
  private boolean _useServicesMechanism = true;

  public TrAXFilter(Templates templates) throws
      TransformerConfigurationException {
    _templates = templates;
    _transformer = (TransformerImpl) templates.newTransformer();
    _transformerHandler = new TransformerHandlerImpl(_transformer);
    _useServicesMechanism = _transformer.useServicesMechnism();
  }

  public Transformer getTransformer() {
    return _transformer;
  }

  private void createParent() throws SAXException {
    XMLReader parent = null;
    try {
      SAXParserFactory pfactory = SAXParserFactory.newInstance();
      pfactory.setNamespaceAware(true);

      if (_transformer.isSecureProcessing()) {
        try {
          pfactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
        } catch (SAXException e) {
        }
      }

      SAXParser saxparser = pfactory.newSAXParser();
      parent = saxparser.getXMLReader();
    } catch (ParserConfigurationException e) {
      throw new SAXException(e);
    } catch (FactoryConfigurationError e) {
      throw new SAXException(e.toString());
    }

    if (parent == null) {
      parent = XMLReaderFactory.createXMLReader();
    }

    // make this XMLReader the parent of this filter
    setParent(parent);
  }

  public void parse(InputSource input) throws SAXException, IOException {
    XMLReader managedReader = null;

    try {
      if (getParent() == null) {
        try {
          managedReader = XMLReaderManager.getInstance(_useServicesMechanism)
              .getXMLReader();
          setParent(managedReader);
        } catch (SAXException e) {
          throw new SAXException(e.toString());
        }
      }

      // call parse on the parent
      getParent().parse(input);
    } finally {
      if (managedReader != null) {
        XMLReaderManager.getInstance(_useServicesMechanism).releaseXMLReader(managedReader);
      }
    }
  }

  public void parse(String systemId) throws SAXException, IOException {
    parse(new InputSource(systemId));
  }

  public void setContentHandler(ContentHandler handler) {
    _transformerHandler.setResult(new SAXResult(handler));
    if (getParent() == null) {
      try {
        createParent();
      } catch (SAXException e) {
        return;
      }
    }
    getParent().setContentHandler(_transformerHandler);
  }

  public void setErrorListener(ErrorListener handler) {
  }
}
